IDA Pro vs ILSpy

IDA Pro is a disassembler, decompiler and debugger for analyzing processors, file formats and software. It supports disassembly for more than 60 processor families, and its debugger works with multiple targets, including remote applications. The bundled gooMBA plug-in uses algebraic and program-synthesis techniques, heuristics and an SMT solver to simplify obfuscated binaries. Automation options include the IDA C++ SDK, IDAPython API, IDAT command-line functions and the idalib headless library. Teams can work with GitHub, GitLab, Bitbucket, Gitea or another Git remote, with Git LFS support for large IDB files. Private Lumina is a self-hosted add-on that restricts a knowledge base to authorized users; it exchanges function hashes and metadata rather than entire byte patterns. IDA Pro runs on Linux, macOS and Windows. The IDA Pro Essential plan costs $1,099 a year, with a one-year minimum commitment and no monthly payments. Hex-Rays states that there is no free trial and points users to IDA Free for checking basic capabilities.

ILSpy is free, open-source software for browsing and decompiling .NET assemblies on Windows, Linux, and macOS. Its Avalonia desktop interface converts assemblies to C#, including whole-project decompilation. Assemblies can come from disk, NuGet, running processes, or the Global Assembly Cache, although GAC support is limited to Windows. Search covers types, methods, and properties, with hyperlinks, bookmarks, base and derived type navigation, and an assembly metadata explorer. The application also includes BAML-to-XAML decompilation and support for ReadyToRun binaries for .NET Core. Related tooling includes Visual Studio 2022/2026 support, Visual Studio Code extensions, the ilspycmd dotnet tool, PowerShell cmdlets, and NuGet packages. Desktop plugins and a scripting API extend its use. ILSpy supports bytecode decompilation but not native-code decompilation. The project says it does not collect personally identifiable information, send user files to third-party services, or use application performance monitoring for telemetry. Release 11.1 is listed as the latest version, under the MIT License.